OP
Deleted member 9648
Because your working in an area thats notifiable, your working in a special location, and all works need to comply with current regs. As my edit above would you be happy replacing a shower with no RCD protection or suplementry bonding in a bathroom?
Straight like for like is maintenance.....not installation. If the shower complied with the regs when originally installed and nothing has changed there is no reason to upgrade anything for a like for like.